Scale-beam.



' RTE d FREE-337551513X J. SOIEILEIIK, OF WASHINGTQN, DISTRICT 0F COLUMBIl' SCALE-BEAM.

Specification of lletccrs Patent.

Ecvtented Jan. 21,1918.

Application filed September 14, 1917. Serial No. 181,411.

(DEDICATED 1'6 THE EUBLIC.)

To all whom it may concern:

Be it known that l, FREDERICK J. donning, a citizen oi the United States, and an employee of the Bureau of Standards, United States Department of Commerce, a legal resident of the State of Illinois, residing at the city of il nshington, in the District of Columbia, (whose post-oilice address is 14% M street, N. llh, )have invented new and useful improvements in Scalelleams, and have made application by petition of even date herewith, under the act of March 3, 1883, chapter H3, (22 Stat, 625,) praying that Letters Patent therefor may e granted to me.

The invention herein described claimed may be used by the Government of the United States or by any ofits of'ficers or employees in the prosecution or Work for the United States, or by any person in the United States, Without payment of any royalty thereon.

The following is a specification of the invention My invention relates t an improved method for providing accurately spaced notches on the Weigh-beams of scales. It provides for the use of simple elements of high accuracy, of low first cost and easy replaceabilit and it eliminates all necessity for empirical correction at individual notches, as has been required in the past on all Weighing scales having a high capacity represented in the travel of the sliding poise.

In the ordinary method of notching the Weigh-Mains of scales, adjustment of the notches is inatterot difficulty and it has been. impossible to form such notches accurately enough by the avuilableinachine tools, to obtain that precision required to give the necessary accuracy of weight indication for all scales having high capacity indicated by the motion of the sliding poise, as reierred to above. For this reason, it has become customary individuslly to adjust the notches, oftentimesSOO'or more in number. That process, which is necessarily slow and expensive, is entirely avoided by the construction shown in this invention.

In my invention a number of balls are employed, so arranged c chennel or groove as to be retained in n straight. line deiised by such channel or groove, and to forced into t r contiguous suriaces 1,. W L minus: olcuggl one; tit is to he and understood that slight deviations from true straightness in the groove or trough will only to a slight degree affect the distance between centers of the-balls.) The sliding poise is provided with a projection or dog balls and adapted to be raised out of or we engaging with the upper surfaces of the gageinent at such times as the poise is moved longitudinally on the beam, by lifting the poise relatively to the beam on whiclrit slides. By this construction, the upper hemispheres of the halls in the row form a system of notches by means of which the position of the poise, through co hction of its dog with the ball surfaces, is determined.

es f

As is well known, commercial metallic The nature, characteristic features and f scope of my invention will be more readily understood by the following description taken in connection with the accompanying drawings.

in the 'clrawings: Figure 1 is an elevation of a portion of a typical Weigh-beam with on applied poise embodying my invention. Fig.

2 is a transverse section of the some weighbeam with an applied poise, thissection being taken at the plane 11-11. Fig. 3 repre sents in section another method than that of Fig, 2 for holding and aliningythe bolls forming the notch system. Referring more particuhu'ly to the drawings: 1 indicates the Weigh-beam, comprising the usual graduations. The weigh-beam contains a groove.

2 in which are located in contact and alon a straight line a series of balls 3 comprise within a quasi-tubular envelop 4:, which may he simply constructed by milling away it portion of the periphery of a suitahle metallic tube, and is held in posltion wlthm the beam 1 by means of suitable screws 5. The poise 6 is recessed to receive the dog 7-, fixedly 21k;

taohed thereto, having a wedge-shaped lowerend projecting downwardly between the ball surfaces, as shown in the dotted lines of Fig. 1. Clearance is provided between the surfaces 8 and 9 to allow of the poise being lifted suificiently'to permit of motion of the tip of the dog post the upper surfaces oi the halls 11o so thee by so the peise it be meveci-freeiy the and 10mm by tiel expansion e'f beiis the balls in line is means. An engine? gi'eeve is cut, iii-veeiihe eeii'eci he girec'iuatiene of the beam suitably (lie nosed. in aeietiee to the pesiizien 01 the 'respemiing neixehi @ppesite 1G. is seen. See fidueiei mark '11 pmviding' for the reading the Weigiii indicaiziens of the scale. A suitebie deem-e is pre videii at each end ef iaiie tubule? eien'ient desseribed, e0 prevent endwise IIlQtiOli! e75 itiie system 0]? balls, When desirebie 01:" expedient this closure be at an eiestie. m? spring-eczema type te previcie fer difi tree engegement of tindeg 10 represents "bxiiar s'sruemee,

In Fig. 3- 1211 Wine flea} height sligiatl Mien the (if the balls to be One 01? the i'eteiei faces 01? fliis gireeve n iei eeshow" f2, While the row e1? be eppesi'fie side by a, which forms the egg: eeing wietaiis of the menstruation shown may be 211- teied 01' omiizied Without eiepai'ting from the spirit 0f this invention, as is defined by the foliewing claim:

A scale-beam having a series of bells a1?- mnged fixedly ill a row longitudinally of the beam and affording by thegaps betweened jaeent bails at one side of their common line of closest approach, notches Which serve to estabiish the several positions of the poise eieng the beam.

Signed at Washingwn, D. G. this 13th day of septembez 1917.

FREDERICK J. SCHLINK.

VVixteese 2 L. id e-Wm M Tmionem M. Emmy. 

